Telephone-transmitter.



3 1 mutter attic-um;

0 00 M Q M f w UNITED s ATEsPATnNT onnron.

WILLIAM W. DEAN, OF

TE LE PHONE-TRANSMITTER.

- To all whomit may concern:

- Be it known that I, WILLIAM W. DEAN, a

I citizen of the United States, residing at Elyria, in the county of Lorain and State of Ohio, have invented certain new and useful Im rovements in Telephone-Transmitters, of

' whlch the following is .a specification, refer:

ones being had therein to the accompanying drawing. 7 1 I My invention relates to telephone transmitters and has for its object the im rovement of transmitters having inverte but tons, as described and claimed by me inmy Patent No. 823,768, issued June 19, 1906.-

I higher overtones to be picked up, and the general sensitiveness of the instrument to e lncreased, to quite the degree that I' have found attainable by cutting out the central portion of the main diaphragm, sothat the,

ottom of the resistance cup may be itself 1 ex osed to the voice waves:

n order to stiffen the main diaphragm and v at the sametimeprevent any-undue projection on the face thereof, I form' a, flange around the orifice, whichjI' cause to project rearwardly and insert the resistance cup in:

the opening with'a shoulder resting on the am enabled to dis ense with' the accurate By one feature of my present invention I forming or boring ofthe fiangedorifice in the diaphragm, heretofore necessitated by the. fact that the resistance cup has been seated therein, and at the same time I improve the structure of thecup, a second feature of my intention consists-in the employment of a disk of-cheap'metal faced with a very thin- .sheet of platinum rolled on for. the front electrode.-

quite. ex ensive to properly p ate the interior-oft a resistance cu or button, and gold is not the best possib e material for an electrode. Platmum has always been con- Specification' of Letters Patent. Application filed August 9. 1905. Serial No. 273M53- its excessive cost.

mitter embodying In Fig. 2 is an enlarged etail of the front elec-' e latter by suitablesprings. v

I have found it ver diflicult and Patented Feb. 4, 1908.

sidered the ideal'material on account of its power to resist corrosion and high temperature, but has been little used onaccount of culties I roll platinum of any desired thickne'ss upon a base metal such as brass,-German silver, 'etc., and punch a disk out of such metal which I place within the forward end of the on and spin the periphery of the cup around t e disk.

My. invention is illustrated-in the accompanying drawing in which Figure 1 1s a transverse'section of a transtrode.

Referring to thedrawing 1, 2 and 3 represent the'front plate, the inclosinglshell, and the rubber mouth iece, respectively, all of the" usual form. esting upon the front plate and separated therefrom by theinsu ating gasket 4 is the main diaphragm 5 having a punched central opening 6 surrounded by the circular fiang'e7 adapted to engage and transmit motion to the carbon button.

Secured to the front plate in the usual man- To obviate these difiiner is'the bridge 8 whichhasconnected'to but insulated from it.the plate 9 supporting the button stud 10. This studcarries the rear electrode 11,- and interposed'between the electrode and the flange 12 on'thestud is a ELYRIA, OHIO, ASSIGNOR TO THE DEAN ELECTRIC COMPANY, OF ELYRIA, OHIO, A CORPORATION OF OHIO.

improvements, and

supplemental dia hragm 13 of'inica or the like. This-supp emental diaphragm rests upon' the ed eot the cup leandis clamped diaphragm in its proper workingv osition and also stren thens t e cup itse f. A disk that position by,& 'ring15 which holds the formed of ase'metal 16,- such as brass, Ger-Q man-silver, or other like material, having rolled upon its inner surface ,a'platingof plati num 17 of any suitable thicknesaforms the front electrode surface. This plate rests against a small annular shoulder 18 formed "upon the inside of the cup and is held against said shoulder by the edge 19 of the cup, this 1 being turned over preferably by spinmng to form a flange which surrounds-the flange 7 of thediaphragmfi and holds it inposition. suitable insulating liningis placed within the the rear electrode to the on When the arts'areinv lace and before t. e stud 10 has een clam within the bridge'bearing'v plate t s rew, n t ere pr 2 is up'as usual to prevent short 'circuiting from engagement with the diaphragm so that be-" tween the resilienceof the main diaphragm and that of the spring 20 the button adjusts itself. The set. screw mentioned and not shown is then tightened upon the stud 1'0 and,

the transmitter when wiredup is ready for made to bear against the u clamping ring so as 120 310 h ro erositionu on t e ia ra m. P Vifheri assembling-and adju ting the device the diaphra' m is first placed'u'pon the front plate with tile wardl and the button. with] its 'stu.

'per face of the the button in place within thebridge 8 and the bridge screwed into position upon the front plate.

Thespring 'now exerts pressure against the button and thereby forces the button into use. The diaphragm in this instance has its circular flange seated against the plate 1,6

within the turned up portion 19 so that when assembling-the arts the diaphragm is centered and held 111 position by the edges or flange formed by spinning the bottom intov I the cup.

Having thus described my invention what desire to claim and secure by Letters Pat- ,ent is:

1. ha telephone transmitter, a cup containing gfranular material, a dia hragm hav ing a sti ening rib or flange, an an electrode carried by said cup and intraper-iphe'rally engaged by said flange, said'electrode receiving motion transmitted directly from the diaphragm through said flange.

2. A telephone transmitter comprising a cup containing granular material, a diaphragm having a stiffening rib or flange, and an electrode carried by said cup, restingintraperipherally and directly against the edges prf said flange so as to receive motion thereom.

. 3. A transmitter comprising a cup -c on. ,taining granular'material, a diaphragm hav-- ing a central stiffening rib or flange and an electrode carried by said cup resting upon the flange and receiving motion intraperipherally therethrough from said diaphragm.

4. A telephone'transmitter comprising a resistance button, an electrode carried by said button, securing means for said electrode,

said securing means forming a flange, and a diaphragm having a stiffening rib or flange directly engaging said electrode inside of said securing means. v

5. A telephone transmitter having a resistance button comprising a metal cup, an.

circular flange projectin inanother..ele'ctrode held therein by' upsetting the edges of the cup, said upset edges form in a flange, and means in engagement with 831d last named electrode inside the flange .for transmitting motion to the button.

6. A telephone transmitter having a resistance button comprising a containing cup, a platinum faced electrode held within the cup by a flange formed on the cup, a carbon electrode extending into the cup and opposing said platinum electrode, an auxiliary diaphragm supporting the carbon electrode and clamped to the cup, granular carbon in the cup-between the two electrodes, and a main diaphragm having a flange engaging theplatinum faced electrode inside the cup flange to give motion thereto.

'7. In a. telephone transmitter the combination with the main diaphragm having a electrode "movably connected therewith,

'stiifening rib or flange, of a resistance button comprising a cup, a platinum faced electrode forming the bottom of the cup, a carbon elec- 'trode extending piston fashion into the cup and opposing said platinum faced electrode,

' granular carbon in the cup between the two and granular carbon in the cup between said electrodes,the cup being independently-supportedv with its bottom engaging directly against the rib or flange on zthe'diaphragm. 9. In a telephone transmitter, a cup containing granular material, a diaphragm having a central perforation surrounded by a stiffening rib or flange, and an electrode carried by said cup and intraperipherally engaged by said flange, said electrode receiving motiontransmitted directly from the dia hragm through said, flange.

n testimony whereof I aflix my signature in presence-of two witnesses.

WILLIAM DEAN. Witnesses:

A. D. T. LmBY, Gno. A. SoovrLnn- 

